- Mar 06, 2007
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Jeff Dike authored
Fix a few formatting bugs in the signal code. Signed-off-by:
Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- Mar 01, 2007
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Jeff Dike authored
This fixes a problem seen by a number of people running UML on newer host kernels. init would hang with an infinite segfault loop. It turns out that the host kernel was providing a AT_SYSINFO_EHDR of 0xffffe000, which faked UML into believing that the host VDSO page could be reused. However, AT_SYSINFO pointed into the middle of the address space, and was unmapped as a result. Because UML was providing AT_SYSINFO_EHDR and AT_SYSINFO to its own processes, these would branch to nowhere when trying to use the VDSO. The fix is to also check the location of AT_SYSINFO when deciding whether to use the host's VDSO. Signed-off-by:
Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by:
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Allan Graves authored
Add the RAW device driver options to the UML Kconfig.char file so that you may use them in UML. Signed-off-by:
Allan <Graves<allan.graves@gmail.com> Signed-off-by:
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Jeff Dike authored
In the 2.6.20 hang patch, I accidentally threw out an error message. This puts it back. Signed-off-by:
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Jeff Dike authored
Add some locking to host_ldt_entries to prevent racing when reading LDT information from the host. The locking is somewhat more careful than my previous attempt. Now, only the check of host_ldt_entries is locked. The lock is dropped immediately afterwards, and if the LDT needs initializing, that (and the memory allocations needed) proceed outside the lock. Also fixed some style violations. Signed-off-by:
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- Feb 16, 2007
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Jeff Dike authored
A previous cleanup misused need_poll, which had a fairly broken interface. It implemented a growable array, changing the used elements count itself, but leaving it up to the caller to fill in the actual elements, including the entire array if the array had to be reallocated. This worked because the previous users were switching between two such structures, and the elements were copied from the inactive array to the active array after making sure the active array had enough room. maybe_sigio_broken was made to use need_poll, but it was operating on a single array, so when the buffer was reallocated, the previous contents were lost. This patch makes need_poll implement more sane semantics. It merely assures that the array is of the proper size and that the contents are preserved. It is up to the caller to adjust the used elements count and to ensure that the proper elements are resent. This manifested itself as a hang in 2.6.20 as the uninitialized buffer convinced UML that one of its own file descriptors didn't support SIGIO and needed to be watched by poll in a separate thread. The result was an interrupt flood as control traffic over this descriptor sparked interrupts, which resulted in more control traffic, ad nauseum. Signed-off-by:
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- Feb 12, 2007
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Arjan van de Ven authored
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. [akpm@osdl.org: sparc64 fix] Signed-off-by:
Arjan van de Ven <arjan@linux.intel.com> Signed-off-by:
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Alon Bar-Lev authored
Remove in-source externs, linux/init.h is included in all cases. This is a fixups for "Dynamic kernel command-line" patch. It also includes some uml __init fixups so that we can __initdata also its command_line. Signed-off-by:
Alon Bar-Lev <alon.barlev@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by:
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Alon Bar-Lev authored
1. Rename saved_command_line into boot_command_line. 2. Set command_line as __initdata. Signed-off-by:
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Eric W. Biederman authored
Of kernel subsystems that work with pids the tty layer is probably the largest consumer. But it has the nice virtue that the assiation with a session only lasts until the session leader exits. Which means that no reference counting is required. So using struct pid winds up being a simple optimization to avoid hash table lookups. In the long term the use of pid_nr also ensures that when we have multiple pid spaces mixed everything will work correctly. Signed-off-by:
Eric W. Biederman <eric@maxwell.lnxi.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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- Feb 11, 2007
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Al Viro authored
* Split the implementation-agnostic stuff in separate files. * Make sure that targets using non-default request_irq() pull kernel/irq/devres.o * Introduce new symbols (HAS_IOPORT and HAS_IOMEM) defaulting to positive; allow architectures to turn them off (we needed these symbols anyway for dependencies of quite a few drivers). * protect the ioport-related parts of lib/devres.o with CONFIG_HAS_IOPORT. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Alexey Dobriyan authored
Bug: pnx8550 code creates directory but resets ->nlink to 1. create_proc_entry() et al will correctly set ->nlink for you. Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Corey Minyard <minyard@acm.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Jeff Dike authored
This patch fixes some missing ptrace bits on x86_64. PTRACE_ARCH_PRCTL is hooked up and implemented. This required generalizing arch_prctl_skas slightly to take a task_struct to modify. Previously, it always operated on current. Reading and writing the debug registers is also enabled by un-ifdefing the code that implements that. It turns out that x86_64 is identical to i386, so the same code can be used. Signed-off-by:
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Jeff Dike authored
x86_64 needs some TLS fixes. What was missing was remembering the child thread id during clone and stuffing it into the child during each context switch. The %fs value is stored separately in the thread structure since the host controls what effect it has on the actual register file. The host also needs to store it in its own thread struct, so we need the value kept outside the register file. arch_prctl_skas was fixed to call PTRACE_ARCH_PRCTL appropriately. There is some saving and restoring of registers in the ARCH_SET_* cases so that the correct set of registers are changed on the host and restored to the process when it runs again. Signed-off-by:
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Jeff Dike authored
The startup code panics a lot if anything goes wrong early on. This is wrong for several reasons, like the kernel isn't running, so you can't really be calling into it yet, but the harm comes from useful error messages being trapped in the printk ring where no one will ever see them. This patch changes these panics to perror and printf in wrappers which also exit. Normal, informational, prints are also wrapped so that fflush(stdout) is called after each one. This is so the output appears in the correct sequence in the event of an error. Signed-off-by:
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Jeff Dike authored
Comment the lack of locking of data that's set up once at boot time. Also fixed a couple of bogus printks. Signed-off-by:
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Jeff Dike authored
Formatting fixes in the register handling code. Signed-off-by:
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Jeff Dike authored
Comment the lack of locking of the elf data extracted from the ELF headers passed to UML. Signed-off-by:
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Jeff Dike authored
Add an error message when two umids are put on the command line. umid.h is kind of pointless since it only declares one thing, and that is already declared in os.h. Commented the lack of locking of some data in os-Linux/umid.h. Signed-off-by:
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Jeff Dike authored
Fix formatting in the sigio code. Signed-off-by:
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Jeff Dike authored
Comment the use of a mysterious-looking lock. Signed-off-by:
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Jeff Dike authored
Tidying the irq code - make a variable static activate_fd can call kmalloc directly since it's now kernel code added a no-locking comment fixed a style violation Signed-off-by:
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Jeff Dike authored
Fix a bunch of style violations in mem.c. Signed-off-by:
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Jeff Dike authored
We shouldn't be using the os wrappers from os code - we can use libc directly. This patch replaces wrapper calls with libc calls. It turns out that os_sigio_async had only one caller, which was in startup.c, so that function is moved there and its name changed. Signed-off-by:
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Jeff Dike authored
Some style fixes in startup.c. Signed-off-by:
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Jeff Dike authored
Add a couple of comments about some non-locked data. Signed-off-by:
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Jeff Dike authored
Locking comments and emacs comment removal in the low-level memory and temp file code. Signed-off-by:
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Jeff Dike authored
Some small locking and formatting fixes in the ubd driver. Signed-off-by:
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Jeff Dike authored
Replace global queue and lock with per-device queues and locks. Mostly a straightforward replacement of ubd_io_lock with dev->lock and ubd_queue with dev->queue. Complications - There was no way to get a request struct (and queue) from the structure sent to the io_thread, so a pointer to the request was added. This is needed in ubd_handler in order to kick do_ubd_request to process another request. Queue initialization is moved from ubd_init to ubd_add. Signed-off-by:
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Jeff Dike authored
CONFIG_HOST_TASK_SIZE doesn't exist any more. Signed-off-by:
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Jeff Dike authored
kstack_depth_to_print can be made const. Signed-off-by:
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Jeff Dike authored
A bunch of the signal handlers can be made static. Signed-off-by:
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Jeff Dike authored
syscall_index and next_syscall_index turn out not to be used. Signed-off-by:
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Jeff Dike authored
It turns out that resource.c isn't needed. Signed-off-by:
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Jeff Dike authored
prev_nsecs and delta need to be arrays, and indexed by CPU number. Signed-off-by:
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Jeff Dike authored
We need to initialize lists properly. Signed-off-by:
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Jeff Dike authored
Fix a bunch of style violations in mem.c and physmem.c Signed-off-by:
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Jeff Dike authored
Comment some lack of locking in the iomem driver. Also, a couple of variables are in the wrong place, so they are moved. Signed-off-by:
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Jeff Dike authored
Eliminate the open_mutex after complaints from Blaisorblade. It turns out that the tty count provides the information needed to tell whether we are the first opener or last closer. Signed-off-by:
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Jeff Dike authored
Remove the last vestiges of devfs from console registration. Change the name of the function, plus remove a couple of unused fields from the line_driver structure. struct lines is no longer needed, all traces of it are gone. The only way that I can see to mark a structure as being almost-const is to individually const the fields. This is the case for the line_driver structure, which has only one modifiable field - a list_head in a sub-structure. Signed-off-by:
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